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Investments (Sales or Disposals of Fixed Maturity Securities) (Details) - Fixed maturity securities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Proceeds $ 9,259 $ 11,251 $ 12,665
Gross investment gains 257 102 59
Gross investment losses (151) (282) (85)
Net investment gains (losses) $ 106 $ (180) $ (26)